Polycom RMX 1500/2000/4000 Administrator’s Guide
Abbreviation/ | Explanation | |
Term | ||
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ISDN | Integrated Services Digital Network. A set of protocol and | |
| interface standards (voice, video and data) that comprise | |
| a telephone network. There are two types of ISDN lines: | |
| BRI and PRI. | |
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International Telecommunications Union, | ||
| Telecommunication Standardization Sector (formerly | |
| CCITT). An international group that produces official | |
| standards for telecommunications. | |
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LAN | Local Area Network. A group of computers and other | |
| devices linked via a network’s operating system. | |
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LDAP | Lightweight Directory Access Protocol. | |
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Line Rate | The amount of bandwidth used by a communication | |
| device, measured in Kbps (kilobits per second). | |
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LPR | Lost Packet Recovery. An algorithm that creates | |
| additional packets that contain recovery information | |
| necessary to reconstruct lost packets. | |
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MCU | Multipoint Control Unit. Device which allows more than | |
| two sites to be connected in a video conference. | |
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Null modem cable | A serial cable designed to eliminate the need for | |
| communication equipment when two digital devices are | |
| directly connected to each other. | |
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Participant | A person using an endpoint to connect to a conference. | |
| When using a Room System, several participants use a | |
| single endpoint. | |
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PRI | Priority Rate Interface. An ISDN interface designed for | |
| high volume data communication. Consists of 23 B | |
| channels of 64 Kbps each and one D channel of 64 Kbps. | |
| In Europe, the PRI line provides 30 B channels + one D | |
| channel. | |
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PSTN | Public Switched Telephone Network. | |
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